The 21-year-old singer entertained late-night drinkers at Sing Sing bar in New York when she, along with her mother Tish, performed a few songs for a group which included Sky Ferreira, but she put on such a good display that it was hard to find anyone else to take to the stage.

Towards the end of Lily's set, Miley heard her own song 'Wrecking Ball' being played in another room - so she went to join the revellers.

The source added to the New York Post newspaper's Page Six column: "She surprised the group there by jumping onstage."

Miley's karaoke trip came hours after she visited her tattoo artist Bang Bang and they gave one another matching inkings.

(Image: Getty)

The 'We Can't Stop' hitmaker had the tattoo artist etch a crescent moon on her left inner-arm, while she then returned the favour and inked the design onto Bang Bang's thumb.

And the inking session didn't end there, as the singer also opted to pay homage to the Flaming Lips by having the words 'Love Yer Brain' - the title of a 1987 song by the psychedelic rockers - etched onto her right forearm.